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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B1278 or B1279 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the X83 auxiliary audio input.
  2. Ignition ON, test for less than 1 V between the terminals listed below and ground:
    • Signal terminal 1
    • Signal terminal 2
    • If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the T11 multimedia player interface module.
  3. Ignition OFF, test for infinite resistance between the terminals listed below and ground:
    • Signal terminal 1
    • Signal terminal 2
    • If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the T11 multimedia player interface module.
  4. If all of the circuits test normal, replace the X83 auxiliary audio input.